Leaky plug on master cylinder. Replace or repair?

Ummm...this is turning into brakes for dummies (me).

So is a dual reservoir system mean one reservoir sends brake fluid to the front brakes and the other sends fluid to the rear?

And of course one can see an advantage to this system in that. If the brakes go bad on one line (front or rear) there is still the other line to stop the car. Correct? Or am I way off?



Glenn